Chapter 1. User's Guide

The pua_usrloc is the connector between usrloc and pua modules.
It creates the environment to send PUBLISH requests for user
location records, on specific events (e.g., when new record is
added in usrloc, a PUBLISH with status open (online) is issued;
when expires, it sends closed (offline)).

Using this module, phones which have no support for presence can
be seen as online/offline.